Spiral chute.



F. PARDEE.

SPIRAL CHUTE.

APPLICATION FILED JUNE 10, 1915.

I/VVE/VTUR Fran/4' 077566 F.PA RDEE., SPIRAL CHUTE.

APPLICATION FILED JUNE l0, I915.

1,256,372, Patented Feb.19,1918.

a suns-SHEET z.

BY #MM l1 TTORNEY WIT/V588 be made in sizes adapted to difierent sizesof coal, such as egg, broken, stove, chestnut, pea, etc. It can also bemade any howht, in sections from ten to sixteen feet, or in such otherlengths as may be suited to the prevail ng conditions and intended uses.

The outer flange on the floor-plates pre vents or helps to reduce earagainst the edge of the upright band or Wall B: italso prevents or helpsto reduce outside leakage of Water or dust and it strengthens thefloorplate itself. The inner flange has similar functions, that is, itprevents leakage of Water or fine coal dust against the post,strengthens the floor-plate and prevents Wear against the post. Theseflanges practically confine the Wear to the floor-plates wh ch lessensthe cost of repair parts.

The floor-plates may also be of utility in spiral separators and theterm spiral chutes is used broadly, so as to include the variousutilities to which the invention is applicable.

1 Having thus described the invention, What I claim as new and tersPatent is:

1. A. spiral chute, comprising a central post, helical floor-plateshaving upturned outer and inner flanges, said fioor-piates being securedto said post and bearing at their inner edges against said post to forma runway of which the post is the inner Wall, the lower portion of saidrunway having its inner edge spaced away from the post and having aninner downturned flange.

2. A spiral chute, comprising a central post, he al floor-plates havingupturned outer and inner flanges, said floor-plates be ing secured tosaid post and hearing at their inner e-i ges against said post to form arunway of which me post is the inner wall, the inner portion of thelower end of the runway being cut away and having its inner edge spacedaway from the post.

FRLN K PARDEE. l/Vitncsses:

S. A. BARBER, ANNA W. WITTERAU.

desire to secure by Let Copies of this patent may be obtained for fivecents each, by addressing the Commissioner of Patents,

Washington, D. C.

